Timeline API - App installed, but not adding to contact timeline

[jsl15c]

After successfully installing my app in Hubspot marketing account, all "create event" requests are succeeding but not displaying in Contact timeline.

portal id: 7100340

dev portal id: 7587246

[WendyGoh]

Hey @jsl15c,

In order for me to further troubleshoot this, do you mind sharing with me the following:

1. The exact request url that you're using to create/update the timeline event

2. The POST/PUT body